Question

When a cylindrical tube is dipped vertically into a liquid the angle of contact is 140${}^o$. When the tube is dipped with an inclination of 40${}^o$ the angle of contact is:

• A. ${100}^o$
• B. ${140}^o$
• C. ${180}^o$
• D. ${60}^o$

Answer 1

Answer: (B)

${140}^o$

Angle of contact is one of the characteristics of interaction of a liquid with a solid body.
So, it does not depend on inclination of the capillary tube.
So, here contact angle will be ${140}^0$ only.